2JJX:
reference: The Crystal Structure of UMP Kinase from Bacillus anthracis (BA1797) Reveals an Allosteric Nucleotide-Binding Site., Meier C, Carter LG, Sainsbury S, Mancini EJ, Owens RJ, Stuart DI, Esnouf RM, J Mol Biol. 2008 Jul 3. PMID: 18625239

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).